M20B28 no oil in head

[ForcedFirebird]

maybe its my eyes, but are the rockers offset from the cam lobe somewhat more than they should? i thought they ran closer to middle of lobe normally ? i'm not at home to check things. if so perhaps the holes in the shaft are offset a few mm and no longer line up

Yes, that's what I was talking about. The pics on this one appear to be the later Febi rocker shafts, like I mentioned earlier. I had a set of shafts so bad, the rocker pad was actually on the edge of the cam lobe.

Either way, the oil holes on the bottom of the shafts are much larger diameter than the drilled holes in the head. They would have to be really bad off to completely lack oil.

[michael_rpt]

Yes, that's what I was talking about. The pics on this one appear to be the later Febi rocker shafts, like I mentioned earlier. I had a set of shafts so bad, the rocker pad was actually on the edge of the cam lobe.

Either way, the oil holes on the bottom of the shafts are much larger diameter than the drilled holes in the head. They would have to be really bad off to completely lack oil.

Honestly I’m a little bit confused. Can you guys please mark on my pics what can be wrong?
You think the rocker shafts can be manufactured so badly that it causes no oil flow at all?

[digger]

The oil comes up the block through the hole on the exhaust side of the block adjacent to head bolt holes



There is a recess in the head so the oil crosses over into the cylinder head bolt hole (between 3 and 4) exhaust side.



There is an angle drilled hole (red arrow and dashed line) on the exhaust side that intersects the head bolt hole (oil passage) other blue dashed line. This head bolt hole is counterbored so it is larger diameter than the other head bolt holes.



The exhaust rocker shaft has the largest hole to line up with the above angled drilled hole that fills the shaft with oil



The exhaust rockers are fed oil via the smallest holes



The medium sized holes marked below are not used on the exhaust rocker shaft and are blocked off by the shaft journals in the head which have no holes.



There is also another hole intersecting on the same oil hole shown earlier. This allows oil to the camshaft middle journal with the full groove to receive oil



The oil groove in the camshaft then feeds the other (inlet) rocker shaft through the drilled hole



Oil in the inlet rocker shaft is fed to the rockers via the small holes the same as on exhaust side


Oil in the inlet rocker shaft is fed to the other cam journals via the medium sized holes



Oiling for the sprayer comes from the 1st and last journals which have a partial circumferential groove the pumps oil into the sprayer bar through a hole in each of the 1st and last cam journals in the head

[michael_rpt]

The oil comes up the block through the hole on the exhaust side of the block adjacent to head bolt holes



There is a recess in the head so the oil crosses over into the cylinder head bolt hole (between 3 and 4) exhaust side.



There is an angle drilled hole (red arrow and dashed line) on the exhaust side that intersects the head bolt hole (oil passage) other blue dashed line. This head bolt hole is counterbored so it is larger diameter than the other head bolt holes.



The exhaust rocker shaft has the largest hole to line up with the above angled drilled hole that fills the shaft with oil



The exhaust rockers are fed oil via the smallest holes



The medium sized holes marked below are not used on the exhaust rocker shaft and are blocked off by the shaft journals in the head which have no holes.



There is also another hole intersecting on the same oil hole shown earlier. This allows oil to the camshaft middle journal with the full groove to receive oil



The oil groove in the camshaft then feeds the other (inlet) rocker shaft through the drilled hole



Oil in the inlet rocker shaft is fed to the rockers via the small holes the same as on exhaust side


Oil in the inlet rocker shaft is fed to the other cam journals via the medium sized holes



Oiling for the sprayer comes from the 1st and last journals which have a partial circumferential groove the pumps oil into the sprayer bar through a hole in each of the 1st and last cam journals in the head

Wow.. This is something.. Thank you very much, now it's more clear to me. I will check step by step my head, every hole, every journal, everything.

[michael_rpt]

Problem solved.
Holes have been drilled in heads workshop- it's not the best job I've seen but it works (:
Thank you guys for help and beware of SETA heads.
Does any schrick or catcams make cams for SETA head?

[TobyB]

Edit- doh, didn't see page 2. Glad that fixed the problem.

...and yes, you need to drill the other four journals so that all the cam bearings get oil...


t

[ForcedFirebird]

I have yet to see (in person) one of those 885 heads with a 4 bearing cam, I've done a bunch of seta swaps too, they all had a cam with smaller lobes than b25, and 7 bearings. This is the second time since 2007 I saw one come across these forums, though.

[michael_rpt]

I have yet to see (in person) one of those 885 heads with a 4 bearing cam, I've done a bunch of seta swaps too, they all had a cam with smaller lobes than b25, and 7 bearings. This is the second time since 2007 I saw one come across these forums, though.

I have two 885 heads, both SETA- dual springs and camshaft without bearing on 4th journal (middle one)
(:

[ForcedFirebird]

I have two 885 heads, both SETA- dual springs and camshaft without bearing on 4th journal (middle one)
(:

The eta cam is missing three journals completely...
https://www.fcpeuro.com/products/bmw...ft-11311287606

EDIT: The seta cam has grooves on the other journals to pass oil, not just the center one.

[michael_rpt]

Hi guys. I have another problem with my damn car.. I started to lose oil pressure, I changed the oil pump and everything seemed to be fine because I gained around 5 bar on cold engine. The problem started when the temperature increased, on slow rpm pressure is 0.
I checked it with manometer. Can it be caused by drilling this additional hole? Or something else? I found something about oil pressure relief valve- maybe after 40 years it doesn't work properly anymore?